Surgical pump



Oct. 29, 1935.

M. E. DE BAKEY El AL 2,018,999

SURGICAL PUMP 2 Sheets-Sheet 1 Filed Oct. 11, 1954 Oct. 29, 1935. M. E. D BAKEY ET AL SURGICAL PUMP Filed Oct. 11, 1954 2 Sheets-Sheet 2 I awe/whom $34 .7. W6 A (41 1 511ml. a/uwwr U -02.45 WWW Patented Oct. 29, 1935 V 2,018,999 SURGICAL PUMP Michael Ellis De Bakeyand Charles Ernest Schmidt, New Orleans, La., assignors of onethird to George D. Lilly, New Orleans, La.

7 Application October 11, 1934, Serial No. 747,947

8 Claims.

Our invention relates to an improvement in surgical pumps.

An object of our present invention is to provide a simplified'surgical pump similar in its mode of operation to a pump disclosed in our copending application, Serial No. 725,162, filed May operation in the opposite direction being either stopped by a locking device or being perceptibly indicated to the operator.

A further object of the present invention is to provide a device which is simple, which is easily assembled, and is securely maintained in its operable assembly.

In the accompanying drawings:

Fig. 1 is a plan view;

Fig. 2 is a side elevation;

Fig. 3 is a cross-section on the line 33 of 'Fig. l, with the handle turned through 90;

Fig. 3a is a cross-section of the tube disclosed in Figs. 1 to 3.

Fig. 4 is a plan view of a modified form;

Fig. 5 is a side elevation of the base portion of the modified i'orm, shown in Fig. 4;

Fig. 6 is a cross-section on the line 66 01' Fig. 4 with the handle turned through 90;

Fig. 7 is a detail of the locking device of the modified form disclosed in Fig. 4; and

Fig. 7a is a cross-section of the tube disclosed in Figs. 4 to 6.

The pump is composed of a circular base section 2 having an upstanding flange 4 throughout approximately 180 of its periphery. An approximately semi-circular member 6 is adapted to be placed over the flanged portion 4 of the circular base 2, and bolted into position by means of the studs 8 and thumb-screws H].

In assembling the pump for operation, a rubber tube l2 having a flange M on one side thereof is placed against the inside portion of the flange 4, and is secured thereto by placing the semicircular member 6 over the flange l4 of the rubber tube l2 and bolting the semi-circular member 6 to the flange 4. A hinged crank-arm I6 is pivotally secured to the circular base 2 by means of the crank-pin l8 being placed through a hearing 20 upstanding from the center of the circular base 2.

A crank-arm I6 is provided with two rollers 22 and 24 spaced apart from the crank-pin l8 and in position to compress the rubber tube I2 between either the roller 22 or the roller 24 and the upstanding flange 4 and the semi-circular member 6 as the crank-arm I6 is rotated in a clockwise direction.

If the crankrm It should be rotated in a counter-clockwise direction, the crank-arm I6 and the rollers 22 and 24 will assume the position disclosed in dotted lines in Fig. 1 and. the tube will no longer be compressed, hence no fluid will be forced therethrough. Also, if the crank-arm i6 is rotated in a counter-clockwise direction, the flexing of the crank-arm l6 will immediately-be perceptible to the operator and the counter-clockwise direction of rotation will be immediately discontinued.

In the modified form disclosed in Figs. 4 to 7, we provide a single circular base section 30 which is provided with an upstanding flange 32 throughout approximately 180 of its periphery. This upstanding flange 32 is provided with a plurality of holes 34 through which the prongs 36 of the rubber tube 38 are adapted to protrude. The prongs 36 are larger in diameter than the holes 34, so that when the prongs 36 are forced through the holes 34 they will be securely held in position, holding the tube 38 securely against the inner edge of the upstanding flange 32.

In the center of the circular base 36 I provide a bearing surface 40 to hold the crank-pin 42 of the crank-arm 44 in proper position.

The crank-arm 44 is provided with two rollers 46 spaced apart from the crank-pin in position to compress the rubber tube 38 against the upstanding flange 32 when the crank-arm 44 is rotated. The under side oi the crank-arm 44 is provided with lugs 48 which are adapted to allow the spring-pressed pins 50 mounted in the rollers 46 to pass in one direction only, so that ii the crank-arm 44 is rotated in a clockwise direction, the pins 50 will pass the lugs 48 on the under side of the crank-arm 44 as the rollers 46 roll against the tube 38.

If the crank-arm 44 should be rotated in a 45 counter-clockwise direction, the rollers 46 would consequently rotate in an opposite direction, and the pin would abut against the lug 48 on crank-arm 44, and further counter-clockwise rotation of the crank-arm 44 would be stopped.

In this form of pump, it will be seen that the assembly is simple and yet the efficiency oi the operation of the pump is in no manner hindered.

In both of the forms, it will be noted that the crank-pins l8 and 42 have been provided with a.

pin protruding beyond the circular base members 2 and 30. The object of this protruding crank-pin is to provide a space whereon a convenient rotation counter may be attached at the time the pump is assembled for operation.

Such a rotation counting device would serve not only for counting the number of revolutions made by the crank-arm 16 or 44, but also would serve to hold the crank-arm assembled in its proper position, thus keeping the rollers 24 or 46 in their proper position to compress the tube 12 or 38.

In the form of our pump disclosed in Figs. 1 to 3, it will be understood that if the crank should inadvertently or accidentally be rotated in a counter-clockwise direction, the crank arm IE will flex and assume the position shown in dotted lines in Fig. 1. This flexing of the crank-arm will immediately become-perceptible to the operator and the counter-clockwise rotation will be immediately stopped,

It will be understood that minor changes may be made from time to time without departing from the spirit of the invention and the scope of the appended claims. a

We claim:

1. In a surgical pump, an approximately circular base having a flange around approximately 180 of its periphery, a tube and rollers for compressing said tube against said flange only when said rollers are rotated in one direction.

2. In a surgical pump, an approximately circular base having a flange around approximately 180 of its periphery, a tube, prongs on said tube, said prongs adapted to pass through said flange to hold the tube in adjusted position, and rollers for compressing said tube.

3. In a surgical pump, an approximately circular base having a flange around approximately 180 of its periphery, a tube secured to said flange, and rollers adapted to compress said tube against said flange only when rotated in one direction.

4. In a surgical pump, an approximately circular base, an upstanding flange around approximately 180 of the periphery of said base, a tube having a protuberance extending from one side thereof, means for engaging said protuberance to hold the tube in adjusted position, and rollers adapted to compress said tube against said up- 5 standing flange only when said rollers are rotated in one direction.

5. In a surgical pump, an approximately circular base, an upstanding flange around approximately 180 of the periphery of said base, a tube secured to said flange, rollers adapted to compress said tube against said upstanding flange when said rollers are rotated in one direction, and means for disengaging said rollers from contact with said tube when the rollers are rotated in the opposite direction.

6. In a surgical pump, an approximately circular base having a flange around approximately 180 of its periphery, a tube secured to said flange,

a hinged crank-arm pivotally secured to said base, rollers attached to said crank-arm remote from the pivot point thereof, said rollers adapted to compress said tube against said flange when rotated in one direction only.

7. In a surgical pump, a base having a flange around approximately 180 of its periphery, a tube secured to said flange, a hinged crank-arm pivotally secured to said base and rollers attached to said crank-arm at approximately its extremities, said rollers adapted to compress said tube against said flange when rotated in one direction.

8. A device of the character described including a base and compression means rotatable with respect to the base, a curved wall approximately concentric with the center of rotation of said compression means and having openings therein;

a tube compressed between the rotatable compression means and the said curved wall, and prongs on said tube adapted to extend through said openings in said wall to prevent the tube 0 from creeping endwise.

MICHAEL ELLIS DE BAKEY. CHARLES ERNEST SCHMIDT. 

